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Figure 14-2 Radio mailbox schematic.
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Tone burst gating
Control logic
Status register
Interrupt logic
In In GS
Dial tone filter
High group filter
OSC1 OSC2
Oscillator circuit
Low group filter
Digital algorithm and code converter
Control register A 02 CS Control register B I/O control R/W RS0
Bias circuit
Control logic
Steering logic Est StGt
Receive data register
VDD VREF VSS
Figure 14-3 CM8880 touch-tone encoder/decoder block diagram.
BASIC COMPONENTS 185
TABLE 14-1 1209
TOUCH-TONE (DTMF) FREQUENCY 1336 1477 1633
697 770 852 941
1 4 7
2 5 8 0
3 6 9 #
A B C D
TABLE 14-2 BINARY VALUE
DTMF BINARY AND DECIMAL VALUES DECIMAL VALUE KEYPAD SYMBOL
0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
D 1 2 3 4 5 6 7 8 9 0
# A B C
source. The CM8880 requires input/output control lines to animate the touch-tone decoder via the microprocessor. These 3 data-bit pins are used to select the modes of the CM8880: the chip select (CS) pin, the read/write (R/W) pin, and the resistor select (RS0) pin. Table 14-3 depicts all the combinations of the three control pins. The CM8880 is active only when CS equals 0. The R/W bit determines the data direction: 1 read and 0 write. The RS bit determines whether the transaction involves data (DTMF tones) or internal functions, i.e., 1 instructions/status and 0 data. Before you can use the CM8880, you have
186 RADIO MAILBOX
TABLE 14-3 CS RW
CONTROL BIT CS, RW, AND RSO STATUS RSO DESCRIPTION
0 0 0 0 1 1 1 1
0 0 1 1 0 0 1 1
0 1 0 1 0 1 0 1
Active: write data (i.e., send DTMF) Active: write instructions to CM8880 Active: read data (i.e., receive DTMF) Active: read status from CM8880 Inactive Inactive Inactive Inactive
to set it up. The device has two control registers, i.e., A and B. In the beginning of the program listing you will notice the set-up of the registers; also refer to Tables 14-4 and 14-5. The STAMP 2 I/O lines P0 through P6 are used for controlling the touch-tone decoder chip, while P7, P8, and P9 are used to control the ISD voice message IC. The ISD2590 is a 28-pin CMOS voice message chip containing a 480-kbyte EEPROM memory, as shown in Fig. 14-4. The ISD2590 contains preamplifiers, filters, address controller, and memory. The most complex aspect of the ISD2590 is the address selection and mode selection. You can use a microprocessor to address each of the address pins for precise message duration recording and playback. We chose a more simplified approach to operating the ISD2590. Connecting address pins A8/pin 9 and A9/pin 10 to 5 V allows the chip to go into the mode selection mode; see Table 14-6. The ISD2590 can operate in six different modes of operation. Table 14-6 lists jointly compatible modes that can be used together for more complex mode selection. Note that address pin 5 is connected to 5 V while all other address pins , are connected to ground. The voice message chip is controlled via three lines on the voice recorder chip, beginning with the power down (PD) line, which is controlled by the STAMP 2 on pin 13. The second control line is the record/play button on the ISD2590 pin 27, which is controlled by pin 14 on the STAMP 2 pin 14. The third control line is the CE or Start/Pause input at pin 23. The automatic gain control (AGC) on the voice message chip is controlled by the network of resistor R12 and capacitor C14. When the microphone input is used, the ANAIN and ANA-OUT are wired together using R12 and C12. You can also have the ISD2590 accept line-in audio, by connecting the audio source directly to pin 20 and removing R6 and C12. The audio output lines on the ISD2590 at pin 14 and pin 15 are coupled through capacitors C10 and C11 to resistors R6 and R7, which connect the voice chip with an external audio amplifier at U5. An 8- speaker is connected to pins 3 and 5 of the TLC2471I audio amplifier chip. The audio amplifier is powered via a 5-V source, as is the entire circuit. Bypass capacitors C5 and C6 are connected across the 5-V supply to ground. Audio input signals from the radio transceiver are fed to the touch-tone decoder as well as to the ISD2590 voice recorder chip via the voltage divider network formed by resistors
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